66 Cuda question

Pretty much any 22" radiator will fit, except maybe C-body ones or truck ones, they're a little taller. An A-body is an A-body, even early A-bodies. (with certain exceptions). Just because the engine bay is narrower has nothing to do with it. I had a '68 Max Wedge rad in my '65 Barracuda when I bought it. I recently put a '66 rad into a '69 Valiant. It's a no brainer, all the 22" a-body rads are basically the same.

What you need to watch out for is the position of the top and bottom inlets and maybe the bolt hole locations. If you want stock, then you'll need to make sure the inlets are in the right locations, any good rad shop can relocate them if you want, or change your water pump, but then you'll have to change your front cover (timing marks) and all that ****...too much headache. Have the rad shop move the inlets instead.